character: Bumpy Bob
topic: Comparing Smooth and Rough Surfaces
grade: 4
subject: Science
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character: Slick Sally
topic: Understanding Friction on Different Surfaces
grade: 4
subject: Science
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character: Rocky Ralph
topic: Exploring Textures in Nature
grade: 4
subject: Science
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character: Sandy Sam
topic: Effects of Surface Texture on Movement
grade: 4
subject: Science
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